Public CEO owned, or for that matter also Private, corporation contribute to country income through what is called in country "Profit & Loss" table "Income from Enterprises" which is a figure, from CEO point of view, called "Country Resources Used".
Country Resources Used and/or Income from Enterprises is kind of tax and it's around 40% of turnover or product sold in terms of SC$.
It's important to note that this income is independent from profitability of a corporation and the only thing what matters is turnover.
Profit transfer is what is used for State, National or Country controlled Public corporations, corporations owned by a country, and I personally believe it does not matter all that much if it is set to 99% or 0%.
The reason being that "excess" of cash from country owned corporations will get transfered to country no matter what and the Profit transfer then is used only as boost to Financial Index. In other words, if one does not care about a boost to FI, setting Profit transfer to 0% will help to ensure that corporations have enough cash and do not need to take loans. Low Profit transfer, as well as tax, will also help corporations to reach higher Market Value, which can be desirable for certain purposes and situations.